Answer:
She needs 50 ft² of wood to cover the table
Step-by-step explanation:
You need to know the formula for area of a trapezoid, which is 
A = (B1 + B2)h/s     (add the bases together, multiply by the height, then divide 
                                 by 2)
We are given B1 = 12, B2 = 8, and h = 5, so plug them in and simplify
A = (12 + 8)(5)/2
   
     A = (20)(5)/2
        A = 100/2
          A = 50 ft²
 
        
             
        
        
        
Based on the picture, PC = PD
        
                    
             
        
        
        
Answer:
9sqrt2.
Step-by-step explanation:
 sqrt8 + 3sqrt2 + sqrt32 
= sqrt4 * sqrt2 + 3 sqrt2 + sqrt16 * sqrt2
= 2sqrt2 + 3sqrt2 + 4 sqrt2
= 9 sqrt2.
 
        
                    
             
        
        
        
The second and the third one are similar.
        
                    
             
        
        
        
Answer:
Answer is 12
Step-by-step explanation:
f(g(-2))
=f((-2)^2+2)
=f(6)
=-1/2×6^2+5×6
=12